Frequently asked questions
How much extra material should I order?
Usually 5 to 10% for concrete, gravel and tiles, and up to 15% for diagonal tiling or roofs with lots of angles. Running out halfway through costs more than a few spares.
What units do the calculators use?
Metres and centimetres, or feet and inches if you prefer. Gulf suppliers usually sell concrete by the cubic metre, aggregate by the tonne and tiles by the box or square metre.
How do I size an air conditioner for a room?
The AC size calculator gives the BTU and tonnage for the room, adjusted for sun, ceiling height and the number of people.
Can I use these for structural work?
Only for estimating quantities. Foundations, slabs and anything load-bearing must follow an engineer's drawings and your local building code.
How many tiles do I need for a room?
The tile calculator counts tiles and boxes, allowing for the grout joints and a waste margin.
Is anything I enter sent or stored?
No. Every calculation runs in your browser, and nothing you type is sent to us or saved.